A wheel set steering device and a trolley equipped with the structure

Abstract

This utility model discloses a wheel set steering device and a trolley equipped with the structure. The wheel set steering device includes an assembly base and a wheel set. The wheel set includes an axle. The assembly base has a downward-opening receiving cavity. The axle is rotatably connected to the receiving cavity around a vertical axis. A driven member is protruding from the outer wall of the axle. The wheel set steering device also includes a driving member that is movably connected to the receiving cavity, an elastic reset member disposed between the driving member and the mounting base, and a traction member whose lower end is connected to the driving member. The driving member is provided with a driving structure that can cooperate with the driven member. When the traction member is driven, the driving member moves. Through the cooperation of the driving structure and the driven member, the axle can be driven to rotate to a predetermined angle, thereby causing the wheel set to rotate to a predetermined angle relative to the assembly base. Thus, the steering and orientation operation of the wheel set is simpler.

Description

Technical Field

[0001] This utility model relates to the field of trolleys, and more particularly to a wheel set steering device and a trolley equipped with the structure. Background Technology

[0002] Traditional strollers (baby strollers or pet strollers, etc.) typically include a foldable frame, a seat mounted on the frame, and front and rear wheels located at the lower front and lower rear of the frame, respectively.

[0003] Taking the front wheel assembly as an example, the lower front of the stroller is equipped with a wheel assembly seat. The front wheel assembly typically includes a wheel seat, an axle connected to the wheel seat at its lower end, and a wheel connected to the wheel seat. The front wheel assembly is rotatably connected to the wheel assembly seat via the axle around its vertical axis. For orientation purposes, a vertically movable directional component is provided on the outer wall of the assembly seat, and correspondingly, a directional groove is provided on the wheel seat. When orienting the front wheel assembly, it is necessary to rotate the front wheel assembly until the directional groove aligns with the directional component, and then move the directional component downwards so that its lower side inserts into the directional groove.

[0004] The above settings make steering and orientation of the wheelset relatively complicated. Summary of the Invention

[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a wheel set steering device and a trolley with the structure, which makes the steering and orientation of the wheel set simple.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A novel wheel set steering device includes an assembly base and a wheel set. The wheel set includes an axle. The assembly base has a downward-opening receiving cavity. The axle is rotatably connected to the receiving cavity about a vertical axis. A driven member protrudes from the outer wall of the axle. The wheel set steering device also includes a drive member that is movably connected to the receiving cavity, an elastic reset member disposed between the drive member and the assembly base, and a traction member whose lower end is connected to the drive member. The drive member is provided with a drive structure that can cooperate with the driven member. When the traction member is driven, the drive member moves, and through the cooperation of the drive structure and the driven member, the axle can be driven to rotate to a predetermined angle, thereby causing the wheel set 2 to rotate to a predetermined angle relative to the assembly base.

[0007] The driving member is relatively movable up and down and relatively rotatable and is sleeved on the axle; preferably, the driven member is a protruding pin protruding from the outer wall of the axle, and the protruding pin can be integrally formed on the outer wall of the axle.

[0008] The driving component includes a body sleeved on the axle. The body has a first arc-shaped inclined surface and a second arc-shaped inclined surface formed upwards on both sides from the lower end face where it converges. The driving structure includes the first arc-shaped inclined surface and the second arc-shaped inclined surface. Preferably, before the traction component is driven, the lower convergence point is located above the protruding pin in the horizontal direction. Preferably, the elastic reset component is configured such that when the traction component is driven, the elastic reset component can drive the driving component to move downwards.

[0009] The upper ends of the first and second arc-shaped inclined surfaces are also connected to form an upper confluence, and the midlines of the upper and lower confluences are respectively located on both sides of the horizontal direction at 180 degrees; or, the upper ends of the first and second arc-shaped inclined surfaces are spaced apart, and the midline of the space and the midline of the lower confluence are also respectively located on both sides of the horizontal direction at 180 degrees.

[0010] The driving component includes a body sleeved on the axle. The body has a first arc-shaped inclined surface and a second arc-shaped inclined surface formed downwards on both sides from an upper confluence point on its upper end face. The driving structure includes the first arc-shaped inclined surface and the second arc-shaped inclined surface. Preferably, before the traction component is driven, in the horizontal direction, the upper confluence point is located below the protruding pin.

[0011] The lower ends of the first and second arc-shaped inclined surfaces are connected to form a lower confluence, and the midline of the lower confluence and the upper confluence are respectively located on opposite sides of the horizontal direction at 180 degrees; or, the lower ends of the first and second arc-shaped inclined surfaces are spaced apart, and the midline of the spaced apart and the midline of the upper confluence are also respectively located on opposite sides of the horizontal direction at 180 degrees.

[0012] The driving component further includes a connecting portion disposed on one side of the body, and the lower end of the traction component is connected to the connecting portion; the receiving cavity has a first guide groove extending vertically in the inner wall, and the connecting portion extends vertically within the first guide groove; preferably, the elastic reset component includes a first elastic reset component disposed between the connecting portion and the top wall of the first guide groove, or / and the elastic reset component includes a second elastic reset component disposed between the assembly base and the body.

[0013] The outer wall of the drive component body is also provided with a limiting part, which is spaced apart from the connecting part; correspondingly, the receiving cavity is provided with a second guide groove extending vertically on the inner wall, and the limiting part can be moved vertically and vertically within the second guide groove.

[0014] A trolley that can be switched between an unfolded state and a folded state includes the aforementioned wheel steering mechanism.

[0015] The trolley includes a foldable frame and a foldable seat mounted on the frame. A wheel steering mechanism is connected to the lower front or / lower rear of the frame. The upper end of the traction member is connected to the frame, or alternatively, the upper end of the traction member can be connected to the folded seat. The traction member is configured such that when the trolley is folded, the folding of the frame and / or the seat drives the traction member, allowing it to move upwards or downwards. Alternatively, the frame is provided with a locking mechanism for locking it in an unfolded state and an unlocking device for unlocking the locking mechanism. The upper end of the traction member is connected to the unlocking device, so that when the frame is unlocked by driving the unlocking device, the traction member is also driven simultaneously. Alternatively, the frame or seat is provided with a traction member unlocking device, and the upper end of the traction member is connected to the traction member unlocking device, so that the traction member is driven by moving the traction member unlocking device.

[0016] Because this utility model adopts the above-mentioned technical solution, it has the following beneficial effects: As long as the cable is driven, the driving component can move up or down relative to the assembly seat. Through the cooperation of the driving structure (first arc-shaped inclined surface, second arc-shaped inclined surface) and the driven component, the axle can be driven to rotate automatically to a predetermined angle, thereby causing the wheel set to rotate to a predetermined angle relative to the assembly seat. In this way, the steering and orientation operation of the wheel set is very simple. When the trolley is folded, the traction component can be linked, thereby causing the wheel set to rotate from the angle before the trolley is folded to a predetermined angle, making the steering and orientation of the front wheels easier. Before the cable is driven, the wheel assembly can rotate 360 ​​degrees relative to the mounting seat about a vertical axis, so that even if the trolley encounters some obstacles, it can bypass the obstacles because the front wheels can rotate 360 ​​degrees, making the trolley move more smoothly and with less bumps. Attached Figure Description

[0017] Figure 1 This is a plan view of the first embodiment of the wheel set steering device of this utility model when the wheel set is at a first relative angle; Figure 2 According to Figure 1 A three-dimensional schematic diagram; Figure 3 According to Figure 2 An explosion diagram; Figure 4 According to Figure 1 A cross-sectional view along the AA direction; Figure 5 According to Figure 4 Enlarged schematic diagram of part B in the middle; Figure 6This is an enlarged schematic diagram of the wheel axle and the working component in the first embodiment of the present invention when the wheel assembly is at a first relative angle; Figure 7 This is an enlarged schematic diagram of the functional component in the first embodiment of this utility model; Figure 8 This is a schematic diagram of the first embodiment of the wheel set steering device of this utility model when the wheel set is at a second relative angle; Figure 9 For the wheel axle and the working parts according to Figure 8 A magnified diagram of the state; Figure 10 This is a plan view of the first embodiment of the wheel set steering device of this utility model when the wheel set is at a third angle; Figure 11 According to Figure 10 A cross-sectional view along the CC direction; Figure 12 According to Figure 11 An enlarged schematic diagram of section D in the middle; Figure 13 For the wheel axle and the working parts according to Figure 10 A magnified diagram of the state; Figure 14 This is an exploded view of the second embodiment of the wheel set steering device of this utility model; Figure 15 This is an enlarged schematic diagram of the functional component in the second embodiment of this utility model; Figure 16 This is a cross-sectional schematic diagram of the second embodiment of the present invention when the wheel assembly is at the first relative angle; Figure 17 According to Figure 16 An enlarged schematic diagram of section E in the middle; Figure 18 This is an enlarged schematic diagram of the cooperation between the functional component and the wheel axle in the second embodiment of the present invention when the wheel assembly is at a third angle; Figure 19 A schematic diagram showing the wheel group steering device in the first embodiment of the trolley of this utility model; Figure 20 A schematic diagram showing the wheel group steering device in the second embodiment of the trolley of this utility model. Detailed Implementation

[0018] The preferred embodiments of this application will be described below with reference to the accompanying drawings.

[0019] like Figures 1 to 7As shown, this utility model discloses a wheel set steering device 100, which includes an assembly base 1 and a wheel set 2. The wheel set includes an axle 20. The assembly base 1 has a downwardly opening receiving cavity 10. The axle 20 is rotatably connected to the receiving cavity 10 around a vertical axis. A driven member 21 is also protruding from the outer wall of the axle 20. The wheel set steering device also includes a driving member 3 that is movably connected to the receiving cavity 10, an elastic reset member disposed between the driving member 3 and the mounting base, and a traction member 4 whose lower end is connected to the driving member 3. The driving member 3 is provided with a driving structure that can cooperate with the driven member 21. When the traction member 4 is driven, the driving member 3 moves. Through the cooperation of the driving structure and the driven member 21, the axle 20 can be driven to rotate to a predetermined angle, thereby causing the wheel set 2 to rotate to a predetermined angle relative to the assembly base 1.

[0020] In the first embodiment, the driving member 3 is relatively movable up and down and relatively rotatable on the axle 20.

[0021] The driven member 21 is a protruding pin 21 protruding from the outer wall of the axle 20. The protruding pin 21 can be integrally formed on the outer wall of the axle 20, or the protruding pin 21 can be connected to the outer wall of the axle 20 by a connector (such as a rivet, screw, etc.).

[0022] The driving component 3 includes a body 30 sleeved on the axle 20. The lower end face of the body 30 includes a first arc-shaped inclined surface 31 and a second arc-shaped inclined surface 32, and the lower ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 are connected together to form a lower converging point 33. That is, the body 30 forms the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 upwards and outwards from the lower converging point 33 on both sides. The driving structure includes the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32. The upper ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 can be connected or there can be a gap between them.

[0023] In this embodiment, the lower end face of the lower converging point 33 is set to be arc-shaped, that is, the lower ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 are also arc-shaped and connected, or the lower ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 intersect at a straight line, so that from a certain direction, the lower ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 intersect at a point. This setting ensures that even if the lower converging point 33 is located above the protruding pin, when the driving member 3 moves downward, it can definitely drive the protruding pin to rotate and move to the side where the first arc-shaped inclined surface 31 or the second arc-shaped inclined surface is located, thereby ensuring that the protruding pin and the wheel axle can rotate.

[0024] In this embodiment, the elastic reset member is configured such that when the traction member is driven, the elastic reset member can drive the driving member to move downward.

[0025] Preferably, the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 are symmetrically arranged, so that when the driving member 3 moves downward, the wheel axle 20 can rotate to a predetermined angle regardless of whether the protruding pin 21 engages with the first arc-shaped inclined surface 31 or the second arc-shaped inclined surface 32. Specifically, if the upper ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 are also connected to form an upper converging point, then the center lines of the upper converging point and the lower converging point 33 are respectively located on both sides of the horizontal direction at 180 degrees; or, if the upper ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 are spaced apart, then the center line of the space and the center line of the lower converging point 33 are also respectively located on both sides of the horizontal direction at 180 degrees.

[0026] In this embodiment, before the traction member 4 is driven (i.e., when the traction member 4 is in a tensioned and upward state), the driving member 3 is at a relatively fixed height relative to the assembly base 1 and cannot move downward. Furthermore, in the horizontal direction, the lower converging point 33 is located above the protruding pin 21 (whether directly below or above any other position in the horizontal direction, it is considered the lower side). In this state, the elastic reset member is in a tensioned state.

[0027] The driving component 3 further includes a connecting portion 34 disposed on one side of the body 30, and the lower end of the traction component 4 is connected to the connecting portion 34. Preferably, the receiving cavity 10 has a first guide groove 101 extending vertically recessed in its inner wall, and the connecting portion 34 extends vertically within the first guide groove 101. Preferably, the connecting portion 34 is disposed on the side of the body 30 where the lower gathering point 33 is located. Because the outer wall of the body 30 has a relatively large area, the placement of the connecting portion 34 facilitates the connection of the traction component 4.

[0028] The elastic reset member includes a first elastic reset member 51, which is disposed between the connecting part 34 and the top wall of the first guide groove; or / and a second elastic reset member 52, which is disposed between the assembly base 1 and the body 30.

[0029] In this embodiment, both a first elastic reset member 51 and a second elastic reset member 52 are provided. The first elastic reset member 51 can be a compression spring and is disposed between the top wall of the first guide groove 101 and the connecting portion 34. The second elastic reset member 52 can also be a compression spring and is disposed between the top of the receiving cavity 10 and the top wall of the driving member body 30. The provision of the second elastic reset member 52 not only makes the downward elastic force on the driving member 3 more uniform, but also allows the driving member 3 to move downward more quickly after the traction member 4 is released.

[0030] In other embodiments, only one of the first elastic reset member 51 and the second elastic reset member 52 may be provided.

[0031] Preferably, a limiting portion 35 is also protruding from the outer wall of the driving member body 30, and the limiting portion 35 is spaced apart from the connecting portion. In this embodiment, the limiting portion is located at the upper end of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32. Correspondingly, the receiving cavity 10 has a second guide groove 102 extending vertically recessed in its inner wall, and the limiting portion 35 extends into the second guide groove 102, which can move vertically relative to each other. When the limiting portion 35 contacts the top wall of the second guide groove 102, the driving member 3 can no longer move upward, thus limiting the highest position of the driving member 3's downward movement. In this embodiment, when the traction member 4 is in the first state, the limiting portion 35 contacts the top wall of the second guide groove 102. This makes the operation more intuitive. In other embodiments, when the traction member 4 is in the first state, the limiting portion 35 and the top wall of the second guide groove 102 can also be spaced apart. Moreover, the setting of the limiting portion 35 and the second guide groove 102 can also play a guiding role.

[0032] Preferably, a guide member 36 is also provided on the outer wall of the driving member body 30. The guide member 36 is spaced apart from the connecting part 34 and the limiting part 35. Correspondingly, a third guide groove (not shown) extending vertically is recessed in the inner wall of the receiving cavity 10. The guide member 36 can move vertically relative to the third guide groove. This arrangement further ensures that the driving member 3 can only move vertically relative to the assembly base 1 and cannot rotate, and also makes the vertical movement of the driving member 3 relative to the assembly base 1 smoother.

[0033] In this embodiment, two guide members 36 are symmetrically arranged, and correspondingly, two third guide grooves are also symmetrically arranged.

[0034] Preferably, a guide wheel 6 is rotatably connected within the receiving cavity 10, and the traction member 4 moves upward around the guide wheel 6. This makes the routing of the traction member 4 more controllable, thereby making the drive of the driving member 3 more controllable, and consequently making the steering of the wheel assembly 2 smoother and more controllable. In this embodiment, a receiving portion 103 is provided on the side wall of the assembly base receiving cavity 10 above the first guide groove 101. The guide wheel 6 is placed within the receiving portion 103, and a through hole is provided between the receiving portion 103 and the second guide groove 102 vertically. The traction member 4 passes upward through the through hole and then wraps around the guide wheel 6. This arrangement ensures that the guide wheel does not affect the vertical movement of the driving member 3, makes the routing of the traction member 4 more controllable, and also makes the first elastic reset member 51 easier to assemble.

[0035] The wheel assembly 2 also includes a wheel seat 22 connected to the lower end of the axle 20 and a wheel 23 connected to the wheel seat 22. The specific structure of the wheel assembly 2 is known technology, and other structures for the rotatable connection between the axle 20 and the mounting base 1 are also known technology, so they will not be described in detail here.

[0036] The assembly base can be any known and feasible structure, as long as it can achieve the above functions.

[0037] The traction component can be any known and feasible structure such as steel wire or rope, as long as it can achieve the above functions.

[0038] In this embodiment, the steering principle of the wheel set 2 is explained using the example of the wheel set 2 being in the first relative angle position in the initial state: When the traction member 4 is in its initial upward tensioned state, both the first elastic reset member 51 and the second elastic member are compressed; and in the horizontal direction, the lower convergence point 33 of the lower ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 of the driving member 3 is located above the protruding pin 21. At this time, the wheel set 2 can rotate 360 ​​degrees relative to the mounting base 1 around the vertical axis; Figure 1 The image shows the wheel assembly 2 in a first relative angular position relative to the mounting base 1. In this angular position, the lower converging part 33 abuts against the upper end of the protruding pin 21 of the wheel axle 20 or is located at intervals above the protruding pin 21 of the wheel axle 20. When the upward-pulling traction member 4 is released, under the action of the first elastic reset member 51 and the second elastic reset member 52, the driving member 3 moves downward. Since the driving member 3 can only move downward and cannot rotate at this time, the protruding pin 21 will inevitably be forced to rotate from contact with the lower confluence 33 at the lower end of the first and second arc-shaped inclined surfaces 32 to contact with either the first or second arc-shaped inclined surface 31. As the driving member 3 continues to move downward, the protruding pin 21 will rotate along the first or second arc-shaped inclined surface 31 or 32 of the driving member 3. As the protruding pin 21 rotates, the axle 20 will inevitably rotate relative to the driving member 3 along with the protruding pin 21 (e.g., ...). Figure 9 As shown), thus causing the entire wheel assembly 2 to rotate relative to the mounting base 1 (as shown). Figure 8 (As shown, wheel set 2 is in the second relative angle position relative to assembly seat 1). As the drive component 3 continues to move downwards, the axle 20 continues to rotate relative to the assembly base 1 around the vertical axis along with the protruding pin 21 until the drive component 3 can no longer move downwards (when the lower end of the body 30 of the drive component 3, i.e., the lower confluence, contacts the bottom wall of the assembly base, the drive component 3 can no longer move downwards). At this time, the protruding pin 21 also rotates to the junction of the upper ends of the first arc-shaped inclined surface 31 and the second arc-shaped inclined surface 32 and does not contact either the first arc-shaped inclined surface 31 or the second arc-shaped inclined surface 32 (e.g., Figure 11 , 12 (As shown in Figure 13); In this state, the axle 20 is equivalent to rotating 180 degrees around the vertical axis based on the first relative angular position, that is, the wheel set 2 rotates 180 degrees relative to the assembly seat 1 (as shown in Figure 13). Figure 10 The wheel assembly 2 shown is positioned relative to the mounting base 1 at a third relative angle, and can be... Figure 1 (Comparison of angle positions). Moreover, without external interference, wheel set 2 remains in this third relative angle position and cannot rotate relative to assembly seat 1, thus ensuring the stability of wheel set 2 in this third relative angle position.

[0039] If the wheel assembly 2 is positioned between the first and third relative angle positions before the traction member 4 is released, then the protruding pin 21 is spaced below the first arc-shaped inclined surface 31 or the second arc-shaped inclined surface 32. In this position, after the traction member 4 is released, the driving member 3 moves downward, and the first arc-shaped inclined surface 31 or the second arc-shaped inclined surface 32 above the protruding pin 21 will contact the protruding pin 21. Then, the arc-shaped inclined surface in contact with the protruding pin 21 drives the protruding pin 21 to rotate, thereby driving the wheel axle 20 to rotate, that is, driving the entire wheel assembly 2 to rotate until the driving member 3 can no longer move downward, at which point the wheel assembly 2 is positioned relative to the mounting seat 1 at the third relative angle position.

[0040] If the wheel set 2 is already in the third angle position before the traction member 4 is released, the drive member 3 will continue to move downwards until it can no longer move, at which point the wheel set 2 will also be stabilized in the third relative angle position.

[0041] Regardless of the angle at which the wheel set 2 is relative to the mounting base 1 before the traction member 4 is released, when the traction member 4 is driven and released, the downward movement of the driving member 3 will cause the wheel set 2 to be in a third relative angle position relative to the mounting base 1. The third relative angle position is set as the predetermined angle.

[0042] In this embodiment, when the traction member 4 is in the initial upward tension state, and the limiting part contacts the top wall of the second limiting groove, after the traction member 4 is released, the driving member 3 can move upward until its lower end contacts the bottom wall of the receiving cavity 10. This arrangement makes the up-and-down movement of the driving member 3 more intuitive.

[0043] like Figures 14 to 18 In a second embodiment of this utility model, the upper surface of the driving component body 30' includes a first arc-shaped inclined surface 31' and a second arc-shaped inclined surface 32', and the upper ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' are connected together to form an upper converging point 33'. That is, the body 30' forms the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' downwards to both sides from the upper converging point 33' on its upper surface. The driving structure includes the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32'. The lower ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' can be connected or separated by a gap.

[0044] Similarly, the upper end face of the upper converging point 33' is set to be arc-shaped, that is, the upper ends of the first arc-shaped inclined surface and the second arc-shaped inclined surface are also connected in an arc shape, or the upper ends of the first arc-shaped inclined surface and the second arc-shaped inclined surface intersect at a straight line, that is, from a certain direction, the upper ends of the first arc-shaped inclined surface and the second arc-shaped inclined surface intersect at a point. This setting ensures that even if the upper converging point 33' is located above the protruding pin, when the driving component moves upward, it can definitely drive the protruding pin to rotate and move to the side where the first arc-shaped inclined surface or the second arc-shaped inclined surface is located, thereby ensuring that the protruding pin and the wheel axle can rotate.

[0045] Before the traction member 4' is driven (in this embodiment, when the traction member 4' is in a downwardly released state), the driving member 3' is also at a relatively fixed height relative to the assembly base 1' and cannot move downwards. In the horizontal direction, the upper gathering point 33' is located below the protruding pin 21' (similarly, (whether it is directly above or above in other horizontal positions, it is considered as above)). In this state, the elastic reset member is at least partially released.

[0046] In this embodiment, the connecting part 34' is disposed on the side of the body 30' where the upper gathering point 33' is located.

[0047] Correspondingly, the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' are symmetrically arranged, so that when the driving member 3' moves downward, regardless of whether the protruding pin 21' engages with the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32', the axle 20' can rotate to a predetermined angle. Specifically, if the lower ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' are also connected to form a lower converging point, then the center line of the lower converging point and the upper converging point 33' are respectively located on both sides of the horizontal direction at 180 degrees; or, if the lower ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' are spaced apart, then the center line of the spaced apart and the center line of the upper converging point 33' are also respectively located on both sides of the horizontal direction at 180 degrees.

[0048] In this embodiment, the limiting part 35' is located at the lower end of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32', and its cooperation with the second guide groove 102' also plays a guiding role.

[0049] The other structures of the second embodiment are the same as those of the first embodiment, and therefore will not be described in detail here.

[0050] In this second embodiment, taking the wheel assembly 2' in its initial state at the first relative angle position as an example, the steering principle of the wheel assembly 2' is explained: when the traction member 4' is in the initial state of downward release, the first elastic reset member 51 is in a state of at least partial release; in the horizontal direction, the upper convergence point 33' of the upper ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' of the driving member 3' is located below the protruding pin 21', so that the wheel assembly 2' can also rotate 360 ​​degrees relative to the mounting base 1' around the vertical axis; Figure 16 The image shows the wheel assembly 2' in a first relative angular position relative to the mounting base 1'. In this angular position, the upper converging point 33' abuts against the lower end of the protruding pin 21' of the wheel axle 20 or is located below the protruding pin 21' at intervals. When the traction member 4' is driven to move upward, the driving member 3' is pulled upward, and the first elastic reset member 51' is compressed. Similarly, since the driving member 3' can only move upward and cannot rotate at this time, it will force the protruding pin 21' to rotate from contacting the upper converging point 33' at the upper end of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' to contacting the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32'. As the driving member 3' continues to move upward, the protruding pin 21' will rotate along the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32' of the driving member 3', so that the wheel axle 20' rotates relative to the driving member 3' with the protruding pin 21', thereby causing the entire wheel set 2' to rotate relative to the assembly seat 1. As the driving member 3' continues to move upward, the axle 20' continues to rotate around the vertical axis along with the convex pin 21' until the driving member 3' stops moving upward. At this point, the convex pin 21' also rotates to the junction of the lower ends of the first arc-shaped inclined surface 31' and the second arc-shaped inclined surface 32' and does not contact either the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32' (e.g., Figure 18 (As shown); In this state, the axle 20' has rotated 180 degrees around the vertical axis from the first relative angle position, that is, the wheel set 2' has rotated 180 degrees relative to the assembly seat 1', and is also in the third relative angle position relative to the assembly seat 1' (at this third relative angle position, the overall view is the same as in the first embodiment). Figure 10 Furthermore, without external interference, wheelset 2' remains in this third relative angle position and cannot rotate relative to assembly seat 1', thus ensuring the stability of wheelset 2' in this third relative angle position.

[0051] Similarly, if the wheel assembly 2' is positioned between the first and third relative angle positions before the traction member 4' is pulled upwards, then the protruding pin 21' is spaced above the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32'. Thus, after the traction member 4' is released, the driving member 3' moves upwards, and the first arc-shaped inclined surface 31' or the second arc-shaped inclined surface 32' located below the protruding pin 21' contacts the protruding pin 21'. Then, the arc-shaped inclined surface in contact with the protruding pin 21' drives the protruding pin 21' to rotate, thereby driving the wheel axle 20' to rotate, i.e., driving the entire wheel assembly 2' to rotate until the driving member 3' can no longer move downwards, at which point the wheel assembly 2' is positioned relative to the mounting base 1 at the third relative angle position.

[0052] If the wheel assembly 2' is already in the third angle position before the traction member 4' is pulled upward, the drive member 3' will continue to move upward until it can no longer move, at which point the wheel assembly 2' will also be stabilized in the third relative angle position.

[0053] As can be seen from the above, regardless of the angle of the wheel set 2' relative to the assembly seat 1' before the traction member 4' is pulled upward, when the traction member 4' is driven and pulled upward, the downward movement of the driving member 3' will make the wheel set 2' finally be in the third relative angle position relative to the assembly seat 1', that is, the third relative angle position is also the predetermined angle.

[0054] Similarly, in this embodiment, when the traction member 4' is in the initial state of downward release, the lower end of the driving member 3' contacts the bottom wall of the receiving cavity 10'. When the limiting part contacts the top wall of the second limiting groove, the driving member 3' can no longer move upward. This setting makes the up-and-down movement of the driving member 3' more intuitive.

[0055] This utility model also discloses a trolley that can be switched between an unfolded state and a folded state, the trolley including the wheel set steering device 100.

[0056] The trolley includes a foldable frame and a foldable seat mounted on the frame, with the wheel steering mechanism connected to the lower front or / lower rear of the frame.

[0057] The upper end of the traction member 4' is connected to any component of the frame. The upper end of the traction member can also be connected to any component of the folded seat. The traction member is configured such that when the trolley is folded, the linkage of the frame components and / or the folding of the seat can drive the traction member 4', causing it to release or pull its upper end upwards, thereby allowing the drive member 3' to move up or down. In other embodiments, the frame is provided with a locking mechanism for locking it in the unfolded state and an unlocking device for unlocking the locking mechanism. The upper end of the traction member is connected to the unlocking device. When the frame is unlocked by driving the unlocking device, the traction member can also be simultaneously driven to release or pull its upper end upwards, allowing the drive member 3' to move up or down. Regardless of the connection method, when the trolley is folded, the traction member can be linked, thereby causing the wheel set 2' to rotate from its angle before folding to a predetermined angle, i.e., a third relative angle position. This makes the steering and orientation of the wheel set easier.

[0058] Taking the aforementioned wheel steering device as an example, the front wheels of the trolley are connected to the wheel steering device at the lower front part of the frame. During the trolley's movement, the front wheels are in a state where they can rotate 360 ​​degrees around the vertical axis. Therefore, even if the trolley encounters obstacles, the 360-degree rotation of the front wheels allows it to bypass them, resulting in smoother and less bumpy movement. When the trolley is to be folded, with the operation of the unlocking device or the coordinated folding of the frame and seat, the traction member is driven (in the first embodiment, the traction member is released; in the second embodiment, the traction member is pulled upwards). This causes the driving member 3' to move upwards or downwards, driving the protruding pin 21' to rotate, thereby driving the entire front wheel assembly 2' to rotate relative to the mounting seat 1', causing the front wheels to rotate to a forward-facing state, i.e., the aforementioned third relative angle position, and to be positioned at that angle. This configuration minimizes the impact of the front wheels on the further proximity of the frame components during folding, resulting in a smaller folded trolley. During the folding process, if the front wheel is in the first relative angle position, it may quickly come into contact with other components of the frame, preventing the components of the frame from continuing to rotate relative to each other. This results in the components of the frame not being close enough together, thus making the size smaller.

[0059] In other embodiments, a traction unlocking device may be movably mounted on the frame or seat in addition to the unlocking device. The upper end of the traction member is connected to the traction unlocking device, and the traction member is driven by moving the traction unlocking device. In this configuration, the steering of the front wheels cannot be linked to the folding of the frame or seat, but the front wheels can still rotate to a third relative angle position.

[0060] The stroller can be a children's stroller, a pet stroller, or a shopping cart.

[0061] Taking two existing frames as examples, Figure 19 The frame shown is based on Chinese invention patent application 2019106709298 (application date: July 24, 2019, titled "A Foldable Bracket and a Baby Stroller Frame with the Bracket", applicant: Kunshan Aiguo Children's Products Co., Ltd.). The frame includes a front leg 1-1, a rear leg 2-1, a first link 3-1, a second link 4-1, a push handle 7-1, and a third link 8-1. The first link 3-1 is pivotally connected to the rear leg 2-1. The upper end of the second link 4-1 is pivotally connected to the rear end of the front leg 1-1, and the lower end is pivotally connected to the lower end of the first link 3-1. The front leg 1-1 is also pivotally connected to the rear leg 2-1. The first link 3-1... -1's upper end and the upper end of the third link 8-1 are respectively pivotally connected to different positions of the push handle 7-1, and the lower end of the third link 8-1 is pivotally connected to the rear foot 2-1, thus the push handle 7-1, the third link 8-1, the first link 3-1, and the rear foot 2-1 form a four-link structure; the front foot 1-1 is pivotally connected to the third link 8-1; or, the front foot 1-1 is pivotally connected together with the lower end of the third link 8-1 and the rear foot 2-1; the front foot 1 includes a first segment 11-1 extending upwards and a second segment 12-1 extending backwards from the upper end of the first segment 11-1, and the upper end of the second link 4-1 is pivotally connected to the rear end of the second segment 12-1. (To avoid ambiguity caused by the duplication of the numerical identifiers of the frame in the prior art patent application with those in this application, "-1" is added after each original numerical identifier of the frame in the prior art patent application for distinction. This modification does not affect the structure and understanding of the frame in the prior art patent application.) Taking the wheel steering device connected to the lower front part of the frame as an example, that is, the lower end of the front foot 1-1 is connected to the assembly seat 1 of the wheel steering device. More specifically, the lower end of the first segment 11-1 is connected to the assembly seat 1 of the wheel steering device.

[0062] The upper end of the traction member passes over the guide wheel 6 and enters the front foot 1-1. A traction member unlocking device is movably connected to the front foot 1-1. The upper end of the traction member is connected to the traction member unlocking device, and the traction member unlocking device is at least partially exposed outside the front foot 1-1 for easy operation by the operator. The traction member unlocking device (not shown) is configured to be movably connected to the front foot. When the wheel set steering device is configured as described in the first embodiment, in the initial state, the connection between the traction member unlocking device and the traction member causes the traction member to be in an upwardly tightened state. Moving the traction member unlocking device downward releases the traction member, and under the action of the elastic reset member, the drive member moves downward, thereby driving the front wheel set to rotate to a predetermined third relative angle position. When the wheel set steering device is configured as described in the second embodiment, in the initial state, the connection between the traction member unlocking device and the traction member causes the traction member to be in a downwardly released state. By pulling the traction member unlocking device upward, the drive member can be pulled upward, thereby driving the front wheel set to rotate to a predetermined third relative angle position.

[0063] The upper end of the traction component can also be connected to components of the frame other than the front legs, such as the rear leg 2-1, first link 3-1, second link 4-1, push handle 7-1, and third link 8-1, as needed (pulling the traction component upwards or releasing the upward tension on the traction component). Thus, when the frame is folded or collapsed, these components will rotate and move in tandem, causing variations in the distance between different components and the front wheel assembly. This variation will pull the traction component upwards or release the upward tension on the traction component, causing the drive component to move upwards or downwards, thereby rotating the front wheel assembly to a predetermined third relative angle position. The traction component wiring can be arranged according to the connection relationships of the aforementioned components.

[0064] Figure 20The existing frame shown is the frame 10-2 of Chinese Invention Patent Application 201910483987.X (application date: June 5, 2019, entitled "An Infant Stroller", applicant: Kunshan Aiguo Children's Products Co., Ltd.). The frame 10-2 can be switched between an unfolded state and a folded state. The frame 10-2 includes a handlebar 1-2, a front foot 2-2, a rear foot 3-2, a first link 4-2, a second link 5-2, and a third link 6-2. The upper side of the first link 4-2 is pivotally connected to the handlebar 1-2, and the lower side is pivotally connected to the rear foot 3-2. The upper side of the second link 5-2 is pivotally connected to the handlebar 1-2, and the lower side is pivotally connected to the rear foot 3-2. The upper side of the third link 6-2 is pivotally connected to the second link 5-2, and the lower side is pivotally connected to the front foot 2-2. The rear side of the front foot 2-2 is pivotally connected to the rear foot 3-2. (To avoid ambiguity caused by duplication of the numerical identifiers of the frame in the prior art patent application with those in this application, "-2" is added after each original numerical identifier of the frame in the prior art patent application to distinguish it. This modification does not affect the structure and understanding of the frame in the prior art patent application.) Taking the wheel steering device 100 connected to the lower front part of the frame as an example, the front foot 2-2 is connected to the assembly seat 1 of the wheel steering device 100, meaning the front wheel of the frame is the wheel 23 of the wheel steering device 100. Similarly, a traction unlocking device that can move up and down relative to the front foot 2-2 can be provided. The upper end of the traction member is connected to the traction unlocking device. By pulling the traction unlocking device upward, the drive member is pulled upward; or by moving the traction unlocking device downward, the drive member moves downward under the action of the elastic reset member, thereby driving the front wheel assembly to rotate to a predetermined third relative angle position. The connection principle between the traction member and other components of the frame is the same as that of the previous existing frame, so it will not be described in detail here.

[0065] In the two existing vehicle frames mentioned above, the connection between the lower end of the front foot and the assembly seat 1 can be any known and feasible method, and the traction unlocking device and its connection with the upper end of the traction component can also be any known and feasible method, as long as the above functions can be achieved.

[0066] In other embodiments, not shown in the figures, if the frame is equipped with a foldable seat, such as in Chinese patent applications CN202010133030.5 (Patent title: A stroller with easy folding operation and small folding volume), CN202321496060.8 (Patent title: "Carrier frame and child carrying device of foldable carrier and child carrying device"), and CN202221156499.1 (Patent title: "A child stroller"), the lower front part of these frames can be connected to the wheel set steering device of this utility model. Then, the upper end of the traction member can be connected to the seat-related components. Thus, when the seat is folded, the traction member can be pulled upward or released, causing the drive member to move upward or downward, thereby rotating the front wheel set to a predetermined third relative angle position. The wiring of the traction member can be arranged according to the connection relationship of the above-mentioned components.

[0067] Every stroller is equipped with a locking mechanism to lock it in the unfolded state and an unlocking device to unlock the locking mechanism. Regarding the connection between the upper end of the traction member and the unlocking device, those skilled in the art can choose any known and feasible structure according to actual needs based on the aforementioned disclosure, so it will not be elaborated here.

[0068] That is to say, when the lower front part and / or lower rear part of the trolley is connected to the wheel set steering device, the upper end of the traction member can be connected to different components according to actual needs, and the connection can be made in any feasible way without limitation, so as to achieve the purpose of driving the wheel set to rotate relative to the assembly seat to a predetermined angle.

[0069] Those skilled in the art should understand that the terms "upper," "lower," "left," "right," "front," "back," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. When the visual observation changes, the above orientation or positional relationship will also change accordingly, and therefore should not be construed as a limitation of the present invention.

[0070] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.

Claims

1. A wheel set steering device, comprising an assembly base and a wheel set, wherein the wheel set includes an axle, the assembly base has a downwardly opening receiving cavity, and the axle is rotatably connected to the receiving cavity about a vertical axis, characterized in that: The wheel axle outer wall further protrudes a driven part, the wheel set steering device further comprises a driving part movably connected to the accommodating cavity, an elastic reset part arranged between the driving part and the mounting base, and a traction part with a lower end connected to the driving part; the driving part is provided with a driving structure matched with the driven part, and after the traction part is driven, the driving part moves, and through the cooperation of the driving structure and the driven part, the wheel axle can be driven to rotate to a predetermined angle, so that the wheel set rotates to a predetermined angle relative to the mounting base.

2. The wheelset steering apparatus according to claim 1, characterized in that: The driving part is movably connected to the wheel axle and rotatably sleeved on the wheel axle.

3. The wheelset steering apparatus of claim 2, wherein: The driving part comprises a body sleeved on the wheel axle, and a first arc-shaped slope and a second arc-shaped slope are formed on both sides of a lower collection point on the lower end surface of the body and upwardly extended.

4. The wheelset steering apparatus of claim 3, wherein: Before the traction part is driven, the lower collection point is located on the upper side of the protruding pin in the horizontal direction.

5. The wheelset steering apparatus of claim 4, wherein: The elastic reset part is arranged to drive the driving part to move downward after the traction part is driven.

6. A wheelset steering device according to any one of claims 3 to 5, wherein: The upper ends of the first arc-shaped slope and the second arc-shaped slope are connected to form an upper collection point, and the midlines of the upper collection point and the lower collection point are respectively located on both sides of 180 degrees in the horizontal direction; or, the upper ends of the first arc-shaped slope and the second arc-shaped slope are spaced apart, and the midlines of the spacing and the lower collection point are also respectively located on both sides of 180 degrees in the horizontal direction.

7. The wheelset steering apparatus of claim 2, wherein: The driving part comprises a body sleeved on the wheel axle, and a first arc-shaped slope and a second arc-shaped slope are formed on both sides of an upper collection point on the upper end surface of the body and downwardly extended.

8. The wheelset steering apparatus of claim 7, wherein: Before the traction part is driven, the upper collection point is located on the lower side of the protruding pin in the horizontal direction.

9. A wheelset steering device according to claim 7 or 8, characterised in that: The lower ends of the first arc-shaped slope and the second arc-shaped slope are connected to form a lower collection point, and the midlines of the lower collection point and the upper collection point are respectively located on both sides of 180 degrees in the horizontal direction; or, the lower ends of the first arc-shaped slope and the second arc-shaped slope are spaced apart, and the midlines of the spacing and the upper collection point are also respectively located on both sides of 180 degrees in the horizontal direction.

10. The wheelset steering apparatus of any one of claims 3 to 5, 7 to 8, wherein: The driving part further comprises a connecting part arranged on one side of the body, and the lower end of the traction part is connected to the connecting part; the accommodating cavity is recessed with a first guide groove extending upwardly and downwardly on the inner wall, and the connecting part is movably extended in the first guide groove.

11. The wheelset steering apparatus of claim 10, wherein: The elastic reset part comprises a first elastic reset part arranged between the connecting part and the top wall of the first guide groove, and / or the elastic reset part comprises a second elastic reset part arranged between the mounting base and the body.

12. The wheelset steering apparatus of claim 6, wherein: The driving part further comprises a connecting part arranged on one side of the body, and the connecting part is connected to the lower end of the traction part; the accommodating cavity is recessed with a first guide groove extending upwardly and downwardly in the inner wall, and the connecting part is movably extended in the first guide groove.

13. The wheel set steering apparatus according to claim 9, characterized by: The driving member further comprises a connecting part arranged on one side of the body, and the lower end of the traction member is connected with the connecting part; the accommodating cavity is concave with a first guide slot extending upward and downward on the inner wall, and the connecting part is movably arranged in the first guide slot.

14. A wheelset steering device according to claim 12 or 13, characterised in that: The elastic reset member comprises a first elastic reset member arranged between the connecting part and the top wall of the first guide slot, or / and the elastic reset member comprises a second elastic reset member arranged between the assembling seat and the body.

15. The wheel set steering apparatus according to claim 10, characterized by: The body further comprises a limiting part protruding on the outer wall, and the limiting part is arranged apart from the connecting part; correspondingly, the accommodating cavity is concave with a second guide slot extending upward and downward on the inner wall, and the limiting part is movably arranged in the second guide slot.

16. A wheelset steering device according to any one of claims 11 to 13, wherein: The body further comprises a limiting part protruding on the outer wall, and the limiting part is arranged apart from the connecting part; correspondingly, the accommodating cavity is concave with a second guide slot extending upward and downward on the inner wall, and the limiting part is movably arranged in the second guide slot.

17. The wheelset steering apparatus of any one of claims 2-5, 7-8, 11-13, 15, wherein: The driven member is a protruding pin protruding from the outer wall of the axle, and the protruding pin can be integrally formed on the outer wall of the axle.

18. A cart convertible between an unfolded state and a folded state, characterized by: The stroller comprises the wheel set steering device of any one of claims 1 to 17.

19. The cart of claim 18, wherein: The stroller comprises a foldable frame and a foldable seat arranged on the frame, and the wheel set steering device is connected to the lower front or / and rear part of the frame, the upper end of the traction member is connected with the frame, or the upper end of the traction member is connected with the folded seat, and the traction member is arranged such that when the stroller is folded, the folding of the frame or / and the seat can drive the traction member, so that the driving member can move upward or downward; or the frame is provided with a locking mechanism for locking the frame in an unfolded state and an unlocking device for unlocking the locking mechanism, and the upper end of the traction member is connected with the unlocking device, and when the unlocking device is driven to unlock the frame, the traction member can also be driven; or the frame or the seat is provided with a traction member unlocking device, and the upper end of the traction member is connected with the traction member unlocking device, and the traction member is driven by driving the traction member unlocking device to move.

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